为探究不同区域大气PM2.5中金属元素的组分差异、季节性分布规律、富集程度等污染特征,于2015年11月-2016年10月监测了保定地区养殖场、农田和道路3个监测位点PM2.5浓度变化,并分析了PM2.5中金属元素K、Ca、Mg、Al、Fe、Mn、Cu和Zn含量变化特征.结果表明:3个监测位点大气PM2.5日均浓度水平为道路(320.51 μg/m3)＞养殖场(245.67 μg/m3)＞农田(203.63 μg/m3),总金属浓度水平为养殖场(14.76 μg/m3)＞道路(13.77 μg/m3)＞农田(8.91 μg/m3),PM2.5质量浓度和总金属浓度的季节性变化差异明显,但总金属浓度占PM2.5浓度的比值在不同监测位点差异较小,分别为4.49％～8.90％(养殖场)、3.67％～6.22％(农田)、2.85％～6.68％(道路).8种金属元素平均浓度水平大致为K＞Al＞Ca＞Mg,Fe＞ Zn＞ Mn,Cu,其中K、Ca、Mg、Al和Fe浓度相对较高,占总量的97.76％～98.27％.秋季不同监测位点间各金属元素的富集因子(EF值)均为最高,且位点间差异最大,其中农田PM2.5金属元素受人为源影响最小.%To investigate the pollution characteristics of metal elements of atmospheric PM2.5,such as composition difference,seasonal regularities of distribution and enrichment factors,the variation of concentration of the PM2.5 samples at different monitoring sites of dairy farm,farmland and road were monitored during December 2015 and October 2016,and the variation characteristics of metal elements (K,Ca,Mg,Al,Fe,Mn,Cu and Zn) of PM2.5 were analyzed.Results showed that level of daily average concentration of PM2.5 at different monitoring sites was road (320.51μg/m3) ＞ dairy farm (245.67μg/m3) ＞ farmland (203.63μg/m3).The level of total metal elements was dairy farm (14.76μg/m3) ＞ road (13.77μg/m3) ＞ farmland (8.91μg/m3).The seasonal variation of mass concentration of PM2.5 and total metals were significantly different.The differences of ratio variation range of concentration of total metal to PM2.5 at different monitoring sites were small,which were respectively 4.49％～8.90％(dairy farm),3.67 ％ ～ 6.22 ％ (farmland),2.85 ％ ～ 6.68 ％ (road).The level of average concentrations of 8 metal elements was K＞Al＞Ca＞Mg,Fe＞Zn＞Mn,Cu.The concentrations of K,Ca,Mg,Al and Fe were relatively high,accounting for 97.76％～98.27％ of the total metal elements.The enrichment factor (EF) value of each metal element in autumn at different monitoring sites were all the highest.The difference of EF value in autumn was the biggest during the different monitoring sites.The influence of metal elements of farmland by anthropogenic sources was the smallest.
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